javascript 操作MSCOMM32串口通信
javascript直接操作MSCOMM32发数据只能发0到127，128到255不能发。所以要自己写一个activeX控件来进行数据转换
VB6
activeX源代码
'把A1010D十六进制转成字符发给javascirpt
PublicFunctionreceivedata(ssr)
Dimleng
Dimbb()AsByte
bb=ssr
'leng=Len(bb)
Fori=LBound(bb)ToUBound(bb)
tmpHex=Hex(bb(i))
RtnStr=RtnStr&IIf(bb(i)<&H10,"0"&tmpHex,tmpHex)&""
Next
receivedata=RtnStr
EndFunction
'把A1010D转成字节数组发给mscomm
PublicFunctionsenddata(ss)
Dimarr()AsByte
Dims,i,leng
leng=Len(ss)\3
s=Split(ss,"")
ReDimarr(leng)AsByte
Fori=0Toleng
arr(i)=Val("&H"&s(i))
Nexti
senddata=arr
EndFunction
<!--
html
-->
<html>
<head>
<title>JavaScriptMSCOMM32.OCX</title>
<SCRIPTID=clientEventHandlersJSLANGUAGE=javascript>
//重写mscomm控件的唯一事件处理代码
functioncomm_OnComm()
{
varlen=0;
if(comm.CommEvent==1)//如果是发送事件
{
window.alert("发送成功");//这句正常，说明发送成功了
}
elseif(comm.CommEvent==2)//如果是接收事件
{
varleng=comm.InBufferCount;
varinstr=cnv.receivedata(comm.Input);
document.form1.txtReceive.value=document.form1.txtReceive.value+instr;
}
}
</SCRIPT>
<SCRIPTLANGUAGE=javascriptFOR=commEVENT=OnComm>
//comm控件每遇到OnComm事件就调用comm_OnComm()函数
comm_OnComm()
</SCRIPT>
<scriptlanguage="JavaScript"type="text/JavaScript">
//打开端口并发送命令程序
functionOpenPort()
{
if(comm.PortOpen==false)
{
try{
comm.PortOpen=true;
varsendstr=document.form1.txtsend.value;
comm.Output=cnv.senddata(sendstr);//发送命令
}catch(e){
alert(e);
}
window.alert("成功发出命令！");
}
else
{
varsendstr=document.form1.txtsend.value;
comm.Output=cnv.senddata(sendstr);//发送命令
}
}
</script>
</head>
<OBJECTCLASSid="clsid:5220cb21-c88d-11cf-b347-00aa00a28331">
<PARAMname="LPKPath"VALUE="LPKfilename.LPK">
</OBJECT>
<OBJECTid="cnv"
CLASSid="CLSID:6AE2FA6C-7428-4BBC-A80E-8F3F5AF8517A"
CODEBASE="mycnv.CAB#version=1,0,0,0">
<paramname="_ExtentX"value="8467">
<paramname="_ExtentY"value="6350">
</OBJECT>
<objectCLASSid="clsid:648A5600-2C6E-101B-82B6-000000000014"id="comm"codebase="MSCOMM32.OCX"type="application/x-oleobject"style="LEFT:54px;TOP:14px">
<paramname="CommPort"VALUE="8">
<paramname="DTREnable"VALUE="1">
<paramname="Handshaking"VALUE="0">
<paramname="InBufferSize"VALUE="1024">
<paramname="InputLen"VALUE="0">
<paramname="NullDiscard"VALUE="0">
<paramname="OutBufferSize"VALUE="512">
<paramname="ParityReplace"VALUE="?">
<paramname="RThreshold"VALUE="1">
<paramname="RTSEnable"VALUE="1">
<paramname="SThreshold"VALUE="2">
<paramname="EOFEnable"VALUE="0">
<paramname="InputMode"VALUE="1">
<paramname="DataBits"VALUE="8">
<paramname="StopBits"VALUE="1">
<paramname="BaudRate"VALUE="9600">
<paramname="Settings"VALUE="9600,N,8,1">
</OBJECT>
<body>
<formname="form1">
<inputtype="button"name="Submit"value="提交"onClick="OpenPort()">
<inputtype="text"name="txtsend"value=""size="53">
<p>
<textareaname="txtReceive"value=""rows="19"cols="58"></textarea>
</p>
</form>
</body>
</html>